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Title Constructed wetlands reduce cost of treating acid drainage
Creator/Author Douglas, J.H.
Publication Date1992 Apr 01
OSTI IdentifierOSTI ID: 7181340
Other Number(s)CODEN: XZ141
Resource TypeJournal Article
Resource RelationEnvironment Update ; Vol/Issue: 6:1
Subject010800 -- Coal, Lignite, & Peat-- Waste Management; ACID MINE DRAINAGE-- WATER TREATMENT;WETLANDS-- WATER TREATMENT; ASHES;BACTERIA;COAL MINES;DRAINAGE;IRON;MANGANESE;MARSHES;OXIDATION;PLANTS;SWAMPS;USA;WATER POLLUTION
Related SubjectAQUATIC ECOSYSTEMS;CHEMICAL REACTIONS;COMBUSTION PRODUCTS;DEVELOPED COUNTRIES;ECOSYSTEMS;ELEMENTS;METALS;MICROORGANISMS;MINES;NORTH AMERICA;POLLUTION;RESIDUES;TERRESTRIAL ECOSYSTEMS;TRANSITION ELEMENTS;UNDERGROUND FACILITIES;WETLANDS
Description/Abstract The chemical treatment of acid drainage from ash piles at coal-fired power plants and from reclaimed coal mines can be prohibitively expensive and requires an active on-site operation.^Constructed aerobic wetlands developed by the Tennessee Valley Authority (TVA) have demonstrated an 80% success rate in consistently treating acid drainage to meet discharge standards, without chemical treatment.^Recent improvements show a potential for achieving an even higher level of compliance.^The TVA wetlands system relies primarily on aerobic oxidative reactions to remove iron and manganese.^The metals are transformed into insoluble compounds which precipitate.^Cattails and bulrushes planted in the wetlands have a high tolerance to such metals.^Fostering indigenous animal and plant communities in these ecosystems can produce also ecological advantages.^3 photos.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 4-15
System Entry Date2001 May 13

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